package com.hmall.gateway.filter;

import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.config.JwtProperties;
import com.hmall.gateway.tool.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.function.Consumer;

@Component
@RequiredArgsConstructor
@EnableConfigurationProperties(AuthProperties.class)
public class AuthGlobalFilter implements GlobalFilter, Ordered {

        private final AuthProperties authProperties;
        private final AntPathMatcher antPathMatcher=new AntPathMatcher();
        private final JwtTool jwtTool;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.判断是否是登陆请求
        ServerHttpRequest request = exchange.getRequest();
        if (isExclude(request.getPath().toString())){
            return chain.filter(exchange);
        }
        //2。如果要登陆：获取请求头属性authorization的值就是令牌
        String token = request.getHeaders().getFirst("authorization");

        //3.校验令牌，获取用户信息
        try {
          Long  userId = jwtTool.parseToken(token);
            //4.将用户信息传到后端微服务中
            System.out.println("userId"+userId);
            //将用户id设置到请求头
          //  exchange.mutate().request(request.mutate().header("user-info",userId.toString()).build());

            exchange.mutate().request(builder -> {
                builder.header("user-info",userId.toString());
            }).build();
        }catch (Exception e){
            //校验不过则返回，没有授权 401
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        //校验通过放行
        return chain.filter(exchange);
    }

    private boolean isExclude(String path) {
        for (String excludePath : authProperties.getExcludePaths()) {
            if (antPathMatcher.match(excludePath, path)) {
                return true;
            }
        }
return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
